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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab37657e3f6ddc0ce4fbcc2a5f09f3e5d0bb652ff08cc7667c72d0a975aee631' 
  AND token = 'xGxH/CI9V3qPJID4xy49dvXILes6Jnyb2QJdWVoB8ps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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