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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b1a00ae60a2a057aa69bd8029304b6e005fb3937e9e3c6cbec2bdd29b1c1c26' 
  AND token = '0WXyPvI/wjde/lOrgV8tnmVKJTxKXmVPbKgUpp01LmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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