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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69c1729048045b4cb88daefbcb45244d3d94d7185b331121d3fc4217f68a546f' 
  AND token = 'ohaYZqksze4NIWB2z3Z0IhF89X7gRrb1twlmYSigYWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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