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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8f6c1ea4f8b776e0376ec1690faa092eaa6f4bf6a6f7326f98b969b320d7af9' 
  AND token = 'sKj4IMVo0Qt6psAR2+o4Bke7mp4U+YlbWhAsB1SqgGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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