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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d23a8af290206fadf612e15182965ac5415cc7abc1876556f76f0dc5c076bb5' 
  AND token = '7y83YuVnKcGzN7MRdQzpCKG7ADlQfAo346wT6bpfyrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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