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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9fa3753c9ad805a94f330c5255c5ee7c2d111231087b34d3c367e15e8036c8a' 
  AND token = '4tjXt+vxo+SWdAnlp3f0+oPzbQ4o/7RgupqV3Dbi7rU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}