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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d46bcb2d0ca727a29e0d359a9de4b5e8b446f81d98a46598e4c3091910d349b' 
  AND token = 'MVNyITOo8SE2/QpRDDS08+urru0KpUZpWpftM+IbDWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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