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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '8f76d911c9cdf3adfff24b0c717e6a2e105c2223ffad96ef47cbdadd471201f8' 
  AND token = '6c8hmwnuLuUWaUR/76rqqgawLkm/9z301ereIp5+94Q=' 
  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"
    }
  }
}