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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '379562720088680f1dfe5176c40c071d94b928a8e55b1fc1fad01e36cd12a381' 
  AND token = 'h6u75o475gC35RluzMp4OU2KB08Ty8NIzZIOCSMxnIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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