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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '579e2181466d504383d2cfda1bfdfdfbf7b4ea0e91d142063d866703f0e0c4b0' 
  AND token = '2JshZLyj+E8LOV8lrIDEmHW2th2bIFl38riZtuDCP5g=' 
  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"
    }
  }
}