SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'e984940037d67e8717513b8f9fc1a506f9e656383a5ad7bbb92cc1d7032d9787' 
  AND token = 'WmVHO+Kxl2ZqYRCRXDe47UNBxG2l0sgMrx25roL2/0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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