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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '3933fe255bad2333329015cc02d8519c5811b936265a937496209e1cb29a7e66' 
  AND token = '544ncrC3FOgVfTnANj2bsCxsH4OCnVKjoUWEz0HoIkE=' 
  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"
    }
  }
}