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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e594c72483fe64de072c907bee7d3a9fd4b81196a447ffb6340a220de06df02' 
  AND token = 'K3PjTHzHV71NHJ8usypHuRmMZsDXZ899OcUj7meOiYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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