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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a99f8762f43d051ecf3fd310c6ff2afc6d7fea3ed59bc67c028a6f68c47c8374' 
  AND token = 'gcrapjxPTKhP1mhPjAI/TKhPJiqPrCnu0GRfthKReCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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