SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '201ef1f8e31951569d5ad6429cc32d2f90b80f7e72a76f29bc22a6288a798e77' 
  AND token = 'N89KM0XN6Zt63LmNDwZXzknjjJGlKADHAY2BQcG/2jw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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