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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d761fc31bf36c51d6cc3640fc80c30644f0fffb94265edd603840f006ba148f' 
  AND token = 'FzD9P9Ry0s2kzCymAH6LVTiCWyURPQyHX6n8+azz4eY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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