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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '613e37b9e93dbbd38a9190c4f84875c940841bc5a963779c172d215071b780ab' 
  AND token = '2i9xE6x27yPDlWPmeNjaNgeiIlX6n3XaMt+czj5CaaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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