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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'a9ef718cff46a5688da14ca90c31351c0cb38e1fbe1182017cef0311473405d8' 
  AND token = 'dKSYPs8PFuk1c1OZcp5TyLJAM5PM/8gDbq0b1f1YAFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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