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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03dbc918bb1a839e6a2eb1e07b9b37eeed0172d054a277c09c170536d403f7ed' 
  AND token = 'wl9vMWwRuTJk0HPANtM8xSj0XFRbvwjBHzoWreXdECc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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