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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7644ae99960335617a39344c8cf27b5631701ba410a1a800e5782d30658c6c61' 
  AND token = '05ql5xedrxtO5zyssq3/RR9B/bbZX6Sy1RyKGixqDik=' 
  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"
    }
  }
}