Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '014270d73ac04a37ce068bacbb95b1616ca132045dff51cb61ab170399326e19' 
  AND token = 'oMcDbnbAh9jgV1qQCyOrT4tt7fL33jRcoerNqgxlEgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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