SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'c3e1a6921b82573012853bfb31e7e6450e7a8c85b3f5469613590799a98b39ca' 
  AND token = 'qqIFnKjNf+ldnUn458oi2S2wyBIAODmzG75S/ZLghB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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