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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b872a97674e36e274e30ebb2ca8395197dda825ed531b94ee609d648ac005575' 
  AND token = 'YqD/sW5PzfCpjZC36K8yZ9fRaPxh3mcQIE9RQj6YLyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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