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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '246dc6a12dffa0e77ab6ac6ade54f7a254da52c9d06461a2a20ed282edc09296' 
  AND token = 'So5iIV2A6ZHATcT3/43jPWPu6hEGVRyZ8vjzi9IkE2U=' 
  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"
    }
  }
}