Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b8c1eb7856d10280c8fdc29670fe19be16a9ea1c6c8dd922a29b16ea79da285' 
  AND token = 'YWLVa2Y+F6sCvaPmtD05NsIyu7vIicjL6uuvDTp474Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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