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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee237c36226776cd6de44d5832924e740b55d8f398f72c4c20c8b056582c7ea0' 
  AND token = 'Mmjzdv7HDjUdvJ+w8Ou6kZ85c1P8kIswqvdm0LIxy3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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