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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '47204ef6a68df219517c3addf6d3c8d982b95529830f1e1e3c37b9395c6c757e' 
  AND token = '2tN2rt80XtzQKF/1CH8YRK6K37ZHHftVOimNHWplp5U=' 
  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"
    }
  }
}