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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db2091d1c1776e24396be6a13f2143a8604c4cc27469fc941220e57772442e63' 
  AND token = 'lL6ZFowYXDqsKgH09dNfqJm2gQMO9Dpy7a1V2o0eS2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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