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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'd4326e46823167b57a321901eaf5564f3356c395d523345bc56e279cc247fa85' 
  AND token = 'k2Ga5F210t2RO7iZ7sSiTiX+oCjQAlrOpK5NeF/mmPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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