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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '1294700f9b2eb1e4b016d6b3fdcc9d9a912007bd144046403f6805d270bd55ec' 
  AND token = 'U1M2ml19lqwB0wSlEHLRRL+q/ezpgeErloNdZ5H+aEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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