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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0902f769c84289a8c2d8427c119b0dbfb3c92010b3af72df606842f144d89ec3' 
  AND token = 'joXxSX3vtXgUSxIt2dz/Wbm20nOqBSe7Q+wlA92+wi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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