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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b02d3244ca51439fff94d55c48c15af7b9a979c8141850681deec57646e8c175' 
  AND token = '5m3W9dAj6ByhZgXuoWBzIwO8A88L4aBtd8usH732Drs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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