Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fcbf7965c11dcfbba738f4bdfe42f7ec0f6248318807322545398e9ffeb53db' 
  AND token = '9HJaLFVp6I0LvsHNqkW2Cat+Z7GSmxSh/T551SfA0qo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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