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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30aa0f0e102e53d8172971cc2c4c3f72c8ef6c70d2937915c0a6e4837260afab' 
  AND token = 'zd8RBkMRUTkqQiAWkJO2s88U0Ig9nwG/VLqLO/v5LbY=' 
  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"
    }
  }
}