SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eda737b7f2df3d5f2a6f02476a188f75ff386b8239bc0859711f43183b376cc9' 
  AND token = 'UqgjBZhv+JgY8Tcaj1Y76laj5ZYr8Zr82LtS3n/2ywU=' 
  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"
    }
  }
}