Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8497bd3ba9f1e0bf8c08983ca3e2173937e0cf853c147f30f26b68e63513fb0' 
  AND token = 'shOOnDzp37Qlr8ZybBxlX1idRtg3vupEwQTbO7XlsHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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