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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '2db4180dfdd0b07582ff45d7ef8efc2ef728fa3fc079516d90c09d1e3fb831fc' 
  AND token = '2BRJ1RiqAgt/BlU9+3alA4Erj6PdHiyvuXPsY6v4Ne4=' 
  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"
    }
  }
}