SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd6bf96f193c2321387629910f845cf769654ed716344fc83d7e4675188958bf' 
  AND token = 'BIj/lcuP2+VPKsOByNPjc894lULyQitDUrgSS1tG6Zw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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