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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f670e3c4c62895b5f43e814c1af6584fcf34bf0f3163e950f576ef018457f20' 
  AND token = 'Mv8d4bSw4THSq4gV622XtL8vujobbr+Hmf9psRHeeP8=' 
  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"
    }
  }
}