Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5e53e91d286866df4c6010b89e0b84b06211dec7ec548c4feac543a2018b195' 
  AND token = '3gTh7shSyTTAHZ/1zkmBBfVUhhuPRIRWM/NSiqApgbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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