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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '5c9c4bd10620c8be864543e0e5511786bd139d56b291b1d09d044c40688bd42f' 
  AND token = 'c8dFOgRJlluY8MDMUDaV46uWo+/zvwpa0UMQt6V0Bfk=' 
  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"
    }
  }
}