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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a47e631fd6c1410101a7795fd2bd18330fd05535c5aa1ce56614f641c54194b' 
  AND token = 'wess/1TvbFhTUcwK5PVfEMUbm7Mv4bz1sIzF2JnJYVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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