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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b19db4e3b5adabe247431004eddf538a503fc16c7595cefad5c8b45863d130e' 
  AND token = 'Qz5j0c4Fci9VYtdZ3Mvkl7NbXravyhWQ+ZYigSY0RuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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