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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'a8c508b9fcc481103a2f0763ad0d79d833e7770533c29e03341fb4f0e8559be4' 
  AND token = '7B92DvnFKMPVE6oEg3pNwNCminNEg0tz2NzPTl7j4lA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

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