SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'b8ee728841d80861295597b16c7d53b68bc8f731c17888a17c4f97a76a354f50' 
  AND token = 'CTe3BSYJh515fA31SMWr8jSK5+YGVPXpmSCGMhwLdtg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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