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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3e01b2b192b9352370756f62443776ec6899eeb5e65674b2aa17cd67a1c2113' 
  AND token = 'KUuML3Xfo2Xxo8Aso8OuMB4KH+Gs2hWSthy0WVjgN4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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