Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8027ecdfc65e833c1aad208a121f8fa7f99adb5675076b685577d1e35489a44f' 
  AND token = 'ni942xExA9aLvMHXmbdoQLGHohvgRT/TIbeSci+b1Ow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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