Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83e383e12cda341a1b79057b45378c55c110aad56716fe7752b97ef8fd071251' 
  AND token = 'J0SMT8umkRSMccRvmFFuLQW0qbbtNwZkf74iAC4FscA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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