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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '850bab04f5d8552c2545a8414a0a7e16df1cba8b16541673f00a90c24fdafd37' 
  AND token = 'v89cmIknRuunqOeZa/gxgezShc6Vdpg9CwNPuxVE42I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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