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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1d64ee6435fe47af7d8980507ec84f794190ea36e785d17e05b8efe22e315da' 
  AND token = 'gcT0w7c7iKHR1vXy0hvxgZ4ypp60qmzSNQCTroQM20g=' 
  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"
    }
  }
}