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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a5c266f6d7a11c99a3b076c79fc0ae07e008fa7b08b18d0692735eaac9e5fdd' 
  AND token = 'Z94+OnNlUvV8kP4iFZUijwU0w6QbzpIgCB8Umi6MqM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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