SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '93a871a32e6e5f4d1dc753f587cb531a6252d5b9f8b357432c29c8a41fe11372' 
  AND token = '57IXBvAEqLY/3qZrRg/uqngh2HSlOQVf0t23FubR1zw=' 
  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"
    }
  }
}