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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '6e5a8898f2025d1b3fda758d6aeb0313aaafe41eefffcf315ace128b2fb8f383' 
  AND token = '6yjxyxFyExFvLxcHJxL1gWvD8dBsoyY8ekoGyJPxHWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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