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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8090d64fd87afe3217943556b523dd730a6e20661bf3ace03cd02aa044db3c57' 
  AND token = 'qGqSV2y0WnuL1RT8iS1HFa4LeCIj2Wx5jpfoRoQoByg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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