Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a91bdf1189148f10a1f30c6668e72275e628b4f0f67f00cdd8d6af43b03e3d72' 
  AND token = 'Y2IT04ky5M6lOjCwPkM+F44se/Zsn8NL5ey69cpPcFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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