Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79cf9b3b8e084d42b92c970a2ba2850a725ba08985577166add02b3ef6ca9838' 
  AND token = 'BQ+FC3f+pz6KF+n5OpIhDkxNGRnG3gNyAAyOfZrrIyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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