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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ed1b79db60fbd89397958635e6553bd9227996d5b89af5fe18e4aac24f6c948' 
  AND token = 'Um+C1a9q/+fUG9aLzzz1ZO5PkzR9nneirDFkI/vgyTY=' 
  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"
    }
  }
}