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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '249763f8aa5668a5d98222215c872804420292cfe8eb86c128f7fdc0ef25a9ac' 
  AND token = 'tg5Lb3TZXqeTfMGR5XUKuUx6Te/P+PNHBn58cThoCEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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