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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '261063d624ce40795dc31849c165070101ee9f0c15a2dd2fa5234b4e0e340a29' 
  AND token = '1qqgsz7RG9iOOLyDO2uIUd4yJpgyfuc9a5FprqCu4ns=' 
  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"
    }
  }
}