Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd24ccc3f0d1871a40ea783cdd0388699648305d9d668590bee4e2da9ac4ba7e4' 
  AND token = 'wWQp2tKxsAs0imXjmfQrzW1Avvc7nYGm71uAUD1MCZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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