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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79d3e29012c7e501fd33ef8c7cc555487c022328b01fe238797f2683605c80b2' 
  AND token = 'TSShXDelzNjAwmyL8SCvwXNiEUzaIzSskJFf+y7LT2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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