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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6d6a527b8aa91cb7201cadc66a56c4ce66cbc586765a9e912faa5d3eb81ed52' 
  AND token = 'pty8NT1XbSWjAWFs3f+vvhqK2ID32tvC7WoppLgYQNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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