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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c694f8ca04ef76ff6bf5fe3368448007c54897a0a9c1edca4549b47a039d46bb' 
  AND token = 'UKmD8ZBzfHWx4bD1+bWHVmE2oKMp4h8DMbEgmK+83vA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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