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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5033e9437b541cd16e4e9ccdc1802dcddda4735bb9302b253a99ae30b7409eb' 
  AND token = 'ywtwVCydP9RBkqC8GbqksiZwfC1s2rT/SfVp/ZBVVgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00109

JSON explain

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