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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5bbf7d0bd12cf49a238ece210f3f797dbe80ad4031b5e8c8a4c209390123482' 
  AND token = 'KKoB7HSxV4mwUQZA1D9fuq0w9QjRurtle+o+9/G/LFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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