Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67454b16202ebe4c617b29429fdfc61281931af0e5c73bfc1060981937652fb9' 
  AND token = 'DCZqkw87Jn3avc8ZpJWKkr7HWAQRS+mgkE+FZcErAoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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