SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11296a01b84c963e82501d01fbade927cb7fd077659cfe862cc8325bcd3a3824' 
  AND token = 'uvGZq3mNO5K0CUzKCaK2QJECUlUT/QoX8CJ5WIOMEh0=' 
  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"
    }
  }
}