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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '445f3f69cd2112204a628f318e280668ebf9d6b891d84cf765d7c1eaf7981703' 
  AND token = '0aFVmq7S17VNcAzLkeI0FEQuzIo/F30TfCqew+2RASQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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