Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14891d535f86f733e0affe5be13ee32014fa36aef04134d09fd4f8a0b20fa4fb' 
  AND token = 'zZGqO4mzvejr13snKco9BNS27i3JyQXnK48IjPNnn9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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