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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b8cc9ec39952adb74d84d6a1fa615f6419b6703bfeb9db1de27bfab192c1b5f' 
  AND token = 'iuycpN5Z3X6V5lfolj/xFgCpC1T+H5ui6tle0ZTewW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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