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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aba19b75186e3b1cbddb513ec20a7304928a09b28d2d99711bf0dc5a39962d85' 
  AND token = 'vk9c85sOUU6qT/UGaRTUVR3rhlh3gMH1rPezLOoXuLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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