Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2c1c6d7988338e8a369ef3b8dd7ede655dd87f3e085a0fdbc35d0a4497cf782' 
  AND token = 'imIBHtfO8Mg/p0XKhpQZrQExwSJJHg8p1En6sB2nws4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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