SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d297ff02baeba8118c416f43ea5570c948cbd5958718caf7dcacebb74226c5c' 
  AND token = 'IrPB7ztTgdRcqRoV1VleTljg/ugYS/CH8B+hrnMyO5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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