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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '043f8181322fde2615e66bfa2a8e2907349820c0949be9de7994f699607e2186' 
  AND token = 'hVbKio3bK+aXIB+/13yfny/7TvSE0A67o09COrU4c/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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