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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46c700bc00022fcbfaca903c4acfd7d32c73e5c5334bce2f896b03bf827ef564' 
  AND token = 'BHkXntNF06jPcWCzHoGUcundNQ5nowOMrzAiZ7FJw3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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