SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e80d7a841faf843295d34886a317bd31e9d65147ddd46df9abf803109c32a27' 
  AND token = 'JLIzvmquwwyR9D1ZIkXrfDH5Rk5NKTHjCzDcumx+9fE=' 
  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"
    }
  }
}