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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd96ba4250318a25bed0176fbf125119fa64f444eabeb70ea5f5134cef4bb69cf' 
  AND token = 'y+l/mHPSBWPmrAh8YhyMRVLnmt9Mizw0SOCYeIE4Qq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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