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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a16cd54970476d1f4e8a0e0b8dc1375012e0716c4b2e11a72b45f595d1a79fdd' 
  AND token = 'WFqoTcng5EYgA4V9yRGXEK5PThvAHqVq6tq8I/riZKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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