Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c149e426920c75f22c86b796929e9c743d0b16fc7765e746c632ee67b5b389d' 
  AND token = 'n92rVzXf1yhoLmREpalsiXJUP2BWLxnwkoOs02zmir4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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