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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4992e01efda43ca2a1f428df896c896f760079b1460765d55e70d40fea6e19a4' 
  AND token = 'x1ZFnxPSwkKXB/4MfSHEiJsivbpF+gp0ypjfg27Ni2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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