SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b07686299238d674f47e7991fedf14248d561e325d52bc182f5f65031ec1167c' 
  AND token = 'bv3yX9a/hb1jZJw1nsXO3VmpAm4XgpLEQxGM1Cc1awQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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