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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '958161e2e30cec25a210b11472b9c93875d201a2c3012def81142b644734bafc' 
  AND token = '6GxJhJGLnYu68eeFpHFrMpb7b4xh/zoN6T4sAYdxsDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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