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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83067a8dfe34378d10f9bcd9b8a39d2d300e8d8d9e1b10aea011454489b9daf8' 
  AND token = '2vlc0WknxMg+XCWKwTIyPUw8qWMYMzNODBE7UO8I69I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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