Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30938dde733e56fa849ee9100e5d10c5ef0c9bb8d6497ab2ef0534acca7f7ef4' 
  AND token = 'TaPlr1TPO7uOFbxOVGp7uiwLuOvBLKnjxA3VCiPeINc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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